C502 EC Details (1)

6.10
TS
Definition Planting rapid -growing annual grasses, small grains, or legumes to provide
initial, temporary" cover for erosion control on disturbed areas.
Purpose To temporarily stabilize denuded areas that will not be brought to final grade
for a period of more than 21 calendar days,
"Temporary seeding controls runoff and erosion until permanent vegetation or
other erosion control measures can be established. In addition, it provides
residue for soil protection and seedbed preparation, and reduces problems of
mud and dust production from bare soil surfaces during construction.
Conditions Where On any cleared, unvegetated, or sparsely vegetated soil surface where
vegetative cover is needed for less than 1 year. Applications of this practice
Practice Applies include diversions, dams, temporary sediment basins, temporary road banks,
and topsoil stockpiles.
Planning Amoral plants, which sprout and grow rapidly and survive for only one season,
Considerations are suitable for establishing initial or temporary vegetative cover. Temporary
seeding preserves the integrity of earthen sediment control structures such
as dikes diversions and the banks of dams and sediment basins. It can als
o
reduce the amountofmaintenanceassociatedwith these devices. Forexam le
p '
the frequency of sediment basin cleanouts will be reduced if watershed areas,
outside the active construction zone, are stabilized.
Proper seedbed preparation, selection ofappropriate species, and use of quality
seed are as important in this Practice as in Practice 6.1 I, Permanent Seeding.
Failure to follow established guidelines and recommendations carefully may
result in an inadequate or short-lived stand of vegetation that will not control
erosion.
Temporary seeding provides protection for no more than 1 year, during which
time permanent stabilization should be initiated.
Specifications Complete grading before preparing seedbeds, and install all necessary erosion
control practices such as, dikes, waterways, and basins. Minimize steep slopes
because they make seedbed preparation difficult and increase the erosion
hazard. if soils become compacted during grading, loosen them to a depth of
6-8 inches using a ripper, harrow, or chisel plow,
SEEDBED PREPARATION
Good seedbed preparation is essential to successful plant establishment A
good seedbed is well -pulverized, loose, and uniform. Where hydroseeding
methods are used, the surface may be left with a more irregular surface of
large clods and stones.
Liming -Apply time according to soil test recommendations. I fthepl l (acidity)
of the soil is not known, an application of ground agricultural limestone at the
rate of I to 1 1/2 tons/acre on coarse -textured soils and 2-3 tons/acre on fire -
textured soils is usually sufficient. Apply limestone uniformly and incorporate
into the top 4-6 inches of soil. Soils with a pH of 6 or higher need not be
limed.
Fertilizer -Base application rates on soil tests. When these are not possible,
apply a 10-10-10 grade fertilizerat 700-1,000 lb/acre. Both fertilizer and time
should be incorporated into the top 4-6 inches of soil. If a hydraulic seeder is
used, do not mix seed and fertilizer more than 30 minutes before application.
Surface roughening -If recent tillage operations have resulted in a loose
surface, additional roughening may not be required, except to break up large
clods. If rainfall causes the surface to become scaled or crusted, loosen it
just prior to seeding by disking, raking, harrowing, or other suitable methods.
Groove or furrow slopes steeper than 3:1 on the contour before seeding
(Practice 6.03, SPuface Roughening).
PLANT SELECTION
Select an appropriate species or species mixture from Table 6.10a for seeding
in late winter and early spring, Table 6.1Ob for summer, and Table 6,1Re for
fall.
In the Mountains, December and January seedings have poor chances of
success. When it is necessary to plant at these times, use recommendations
for fall and a securely tacked mulch.
SEEDING
Evenly apply seed using a cyclone seeder (broadcast), drill, cultipacker seeder,
or hydroseeder. Use seeding rates given in Tables 6,IOa-6.IOc. Broadcast
seeding and hydroseeding are appropriate for steep slopes where equipment
cannot be driven. Hand broadcasting is not recommended because of the
difficulty in achieving a uniform distribution.
Small grains should be planted no more than 1 inch deep, and grasses and
legumes no more than 1/2 inch. Broadcast seed must be covered by raking
or chain dragging, and then lightly firmed with a roller or cultipacker.
Hydroseeded mixtures should include a wood fiber (cellulose) mulch.
MULCHING
The use of an appropriate mulch will help ensure es(ablishment under normal
conditions, and is essential to seeding success under harsh site conditions
(Practice 6.14, Mulching). Harsh site conditions include:
• seeding in fall for winter cover (wood fiber mulches are not considered
adequate For this use),
• slopes steeper than 3: 1,
• excessive) ]lot or d weather,
Y dry '
• adverse soils shallow, rock or high in clay or sand and
( X g Y ),
• areas receiving concentrated flow.
If the area to be mulched is subject to concentrated waterftow, as in channels,
anchor mulch with netting (Practice 6.14, Mulching).
Maintenance Reseed and mulch areas where seedling emergence is poor, or where erosion
occurs, as soon as possible, Do not mow. Protect from traffic as much as
possible.
References Site Preparation
6.03, Surface Roughening
6.04, Topsoiling
3
S'm_lace Stabilization
N6,11, Permanent Seeding
6.14, Mulching
Appendix
3
8.02, Vegetation Tables
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E r 4TEMPORARY SEEDING DETAIL
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Table 6.10a
Temporary Seeding
Recommendations for Late
Winter and Early Spring
Table 6.10b
Temporary Seeding
Recommendations for
Summer
Table 6.10c
Temporary Seeding
Recommendations for Fall
Species Rate (lb/acre)
Rye (grain) 120
Annual lespedeza (Kobe in
Piedmont and Coastal Plain,
Korean in Mountains) 50
Omit annual lespedeza when duration of temporary cover is not to
extend beyond June.
Seeding dates
Mountains -Above 2500 feet: Feb. 15 - May 15
Below 2500 feet: Feb. 1- May 1
Piedmont -Jan. 1 - May 1
Coastal Plain -Dec. 1 -Apr. 15
Soil amendments
Follow recommendations of soil tests or apply 2,000 lb/acre ground
agricultural limestone and 750 lb/acre 10-10-10 fertilizer.
Mulch
Apply4,000lb/acre straw. Anchor straw by tacking with asphalt, netting,
or a mulch anchoring tool. A disk with blades set nearly straight can be
used as a mulch anchoring tool.
Maintenance
Refertilize if growth is not fully adequate. Reseed, refertilize and mulch
immediately following erosion or other damage.
Seeding mixture
Species Rate (lb/acre)
German millet 40
In the Piedmont and Mountains, a small -stemmed Sudangrass may be
substituted at a rate of 50 lb/acre.
Seeding dates
Mountains -May 15 -Aug. 15
Piedmont -May 1 -Aug. 15
Coastal Plain -Apr. 15 -Aug. 15
Soil amendments
Follow recommendations of soil tests or apply 2,000 lb/acre ground
agricultural limestone and 750 lb/acre 10-10-10 fertilizer,
Mulch
Apply 4,000lb/acre straw. Anchor straw by tacking with asphalt, netting,
or a mulch anchoring tool. A disk with blades set nearly straight can be
used as a mulch anchoring tool
Maintenance
Refertilize if growth is not fully adequate. Reseed, refertilize and mulch
immediately following erosion or other damage.
Seeding mixture
Species Rate (lb/acre)
Rye (grain) 120
Seeding dates
Mountains -Aug. 15 - Dec. 15
Coastal Plain and Piedmont -Aug: 15 - Dec. 30
Soil amendments
Follow soil tests or apply 2,000 lb/acre ground agricultural limestone
and 1,000 lb/acre 10-10-10 fertilizer.
Mulch
Apply 4,000 lb/acre straw. Anchor straw by tacking with asphalt, netting,
or a mulch anchoring tool. A disk with blades set nearly straight can be
used as a mulch anchoring tool.
Maintenance
Repair and refertilize damaged areas immediately. Topdress with 50
lb/acre of nitrogen in March. If it is necessary to extent temporary
cover beyond June 15, overseed with 50 lb/acre Kobe (Piedmont and
Coastal Plain) or Korean (Mountains) lespedeza in late February or
early March.
DDIES:
1. STRUCTURAL STONE SHALL BE
CLASS B STONE.
2, SEDIMENT CONTROL STONE
SHALL BE NO. 5OR NO.57
3, DIMENSIONS ME MINIMUM
ACCEPTABLE UNLESS OTHERW SE
SPECIFIED BY THE ENGINEER,
STRUCTURAL STONE,
7
A
FLOOD STORAGE ZONE MI
SEDIMENT STORAGE ZOlE
FLOW
INVEfli ViVE
NATURAL GROUND
`36" FIREMAN,
SEDIMENT CONTROL STONE SECTION A
5 STANDARD ROCK PIPE INLET PROTECTION
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CONSTRUCTION SPECIFICATIONS:
1. REMOVE AND PROPERLY DISPOSE OF ALL TREES,BRIISH, STUMPS AND OTHER OBJECTIONABLE
MATERIAL.
2. ENSURE THAT THE MINIMUM CONSTRUCTED CROSS SECTION MEETS ALL DESIGN REOUIREMETS.
3. ENSURE THAT If E TOP OF THE DIKE IS NOT LOWER AT ANY POINT THAN THE DESIGN ELEVATION
PLUS THE SPECIFIED SETREMENT.
4. PROVIDE SUFRCIENT ROOM AROUND DIVERSIONS TO PERMIT MACHINE REGRADING AND
CLEANOUL
5 VEGETATE THE RIDGE IMMEDIATELY AFTER CONSTRUCTION, UNLESS IT WILL REMAIN IN PLACE
LESS THEN 3D WORKING DAYS
MAINTENANCE:
INSPECT TEMPORARY DIVERSIONS ONCE A WEEK AND AFTER EVERY RAINFALL. IMMEDIATELY
REMOVE SEDIMENT FROM THE FLOW AREA AND REPAIR THE DIVERSION RIDGE. CAREFULLY
CHECK OUTLETS AND MAKE TIMELY REPAIRS AS NEEDED, WHEN THE AREA PROTECTED IS
PERMANENTLY S7MILIZED. REMOVE THE RIDGE AND TIIE CHANNEL TO BLEND WITH TIIE NATURAL
GROUND LEVEL AND APPROPRIATELY STABILIZE IT.
3 ''}TEMPORARY DIVERSION DITCH
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STEE*!7
CLASSORTONE
5 OR N571
OW
GENERAL NOTES:
MAINTENANCE NOTES:
1. SEDIMENT PETER OUTLET SHALL BE 16 INCHES HIGH BUT NO
L BLUR OUTLETS SHALL BE INSPECTED BY THE FINANCIALLY
TALLER MAN IB INCHES
RESPONSIBLE PARTY OR HIS AGENT IMMEDIATELY AFTER
EACH RAINFALL AND AT LEAST DAILY DURING PROLONGED
2. CLASS 1 OR 2 RIPRAP SMALL BE USED AND COVERED MIT
RAINFALL. ANY REPAIRS NEEDED SHALL BE MADE
6 INCHESOF NCDOT 15 OR#57 WASHED STONE ON THE
IMMEDIATELY.
UPSLOPE SIDE.
2. ME STONE SHALL BE REPLACED PROMPTLYAFTER ANY
3, POSTS SHALL BE NO MORE TOM 4 HE APML
EVENT THAT HAS CLOGGED OR REMOVED IT,
4. SIDE OUTLETS AT ANY POINT SMALL CONCEN TED FUMYS
3, SEDIMENT DEPOSITS SHOULD BE REMOVED WHEN
ME ANTICIPATED AND AT ME DIRECTION OF ME
DEPOSITS REACH MLPTNEHEIGWOFTHEBMRIER.AIN
INSPECTOR.
SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE SILT
FENCE OUTLET IS REMOVED SHALL BE DRESSED TO
5, ONE ACRE MAXIMUM DRAINAGE MCA PER OUTLET,
CONFORM TO ME EXISTING GRADE, PREPARED AND
SEEDED,
ILT FENCE STONE OUTLET
12"MIN. WASHED
STONE FILTER
ROBOT CID. ff 57
Yi✓i mil �.
c nit I-,L,1. , ?.,i•.•�'.1•iSJ+�.R
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P F
1 1F
CROSS SECTION
DESIGN OVERFILL 6- FOR EMERGENCY BY-PASS 6"
SETTLEMENT BELOW SETTLED TOP
21"
SETTLED F CAR n
TOP
5' 1 1 S'-.-✓'
FABRIC
STONE SECTION
2:1 SIDE
SLOPE A1A8.
SIDE
1. CLEAR, GRUB, AND STRIP THE AREA UNDER THE EMBANKMENT OF ALL VEGETATION
AND ROOT MAT, REMOVE ALL SURFACE SOIL CONTAINING HIGH AMOUNTS OF
ORGANIC MATTER AND STOCKPILE OR DISPOSE. OF IT PROPERLY. HAUL ALL
OBJECTIONABLE MATERIAL TO THE DESIGNATED DISPOSAL. AREA.
2. ENSURE THAT FILL MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS, WOODY
THE FILL IN LIFTS NOT TO EXCEED 9 INCHES AND MACIII14E COMPACT IT. OVER FILL
THE EMBANKMENT 6-INCHES TO ALLOW FOR SETTLEMENT,
3. CONSTRUCT THE OUTLET SECTION IN TIIE EMBANKMENT. PROTECT THE CONNECTION
BETWEEN THE RIPRAP AND THE SOIL FROM PIPING BY USING FILTER FABRIC OR A
KEYWAY CUTOFF TRENCH BETWEEN THE RIPRAP STRUCTURE AND THE SOIL
a. PLACE THE FILTER FABRIC BETWEEN THE RIPRAP AND SOIL. EXTEND THE FABRIC
ACROSS THE SPILLWAY FOUNDATION AND SIDES TO THE TOP OF THE DAM;
OR
b. EXCAVATE AKF)AMAY TRENCH ALONG IHE GUILLOTINE OF THE SPILLWAY
FOUNDATION EXTENDING UP THE SIDES 7O 111E HEIGHT OF THE DAM. THETRENCH
SHOULD BEAT LEAST 2-FEET DEEP AND 2-FEET PRIDE WITH to SIDE SLOPES,
4. CLEAR THE POND AREA BELOWTHE ELEVATION OF THE CREST OF THE EMBANKMENT,
5, ALL CUT AND FILL SLOPES SHOULD BE 2:1 OR FLATTER.
6. ENSURE THAT THE STONE (DRAINAGE) SECTION OF 1HE EMBANKMENT HAS A MINIMUM
BOTTOM WIDTH OF MEET AND MAXIMUM SIDE SLOPES OF 1:1 THAT EXTEND TO TI IE
BOTTOM OF THE SPILLWAY SECTION.
7, CONSTRUCT THE MINIMUM HNISHED STONE SPILLWAY BOTTOM WIDTH, AS SHOWN ON
THE PLANS, WITH 2:1 SIDE SLOPES EXTENDING TO THE TOP OF THE OVER FILLED
EMBANKMENT. KEEP THE THICKNESS OF THE SIDES OF THE SPILLWAY OUILET STRUCTURE
AT A MINUMUM OF 21-INCHES. THE WHY MUST OF LEVEL AND CONSTRUCTED TO GRADE
TO ASSURE DESIGN CAPACITY.
8, MATERIAL USED IN THE STONE SECTION SHOULD BE WELL -GRADED MIXTURE, OF STONE
WITH A BAR SIZE OF 9-INCHES (CLASS B EROSION CONTROL STONE IS RECOMMENDED)
AGO A MAXIMUM STONE SIZE OF 14-INCHES. THE STONE MAY BE MACHINE PLACED
AND THE SMALLER STONES WORKED INTO THE VOIDS OF THE LARGER STONES, THE
STONE SHOULD BE HARD, ANGULAR, AND HIGHLY WEATHER RESISTANT
9, ENSURE THAT THE STONE SPILLWAY CUTLET SECTION EXTENDS DOWNSTREAM PAST THE
TOE OF THE EMBANKMENT UNTIL STABLE CONDITIONS ARE REACHED AND OUTLET
VELOCITY IS ACCEPTABLE FOR THE RECEDING STREAM. KEEP THE EDGES OF THE STONE
OUTLET SECTION FLUSH WITH THE SURROUNDING GROUND AND SHAPE THE CENTER 70
CONFINE THE OUTFLOW STREAM (REFERENCES: OUTLET PROTECTION).
10, DIRECT EMERGENCY BYPASS TO NATURAL, STABLE AREAS. LOCATE BYPASS OUTLETS
SO THAT ROW NJILL NOT DAMAGE THE. EMBANKMENT,
11. STABILIZE THE EMBANKMENT AND ALL DISTURBED AREAS ABOVE THE SEDIMENT POOL.
AND DOWNSTREAM FROM THE TRAP IMMEDIATELY AFTER CONSTRUCTION
(REFERENCES: SURFACE STABILIZATION),
12. SHOW THE DISTANCE FROM THE TOP OF THE SPILLWAY TO THE SEDIMENT CLEMOUT
LEVEL (ONE PAT THE DESIGN DEPTH) ON THE PLANS AND MARK IT IN THE HELD.
MAINTENANCE
L INSPECT TEMPORARY SEDIMENT TRAPS AFTER EACH PERIOD OF SIGNIFICANT
RAINFALL, REMOVE SEDIMENT AND REST ORE THE TRAP TO ITS ORIGINAL DIMENSIONS
WHEN THE SEDIMENT HAS ACCUMULATED TO ONE-HALF THE DESIGN DEPTH OF THE
TRAP, PLACE THE SEDIMENT THAT IS REMOVED IN THE DESIGNATED DISPOSAL AREA
AND REPLACE THE CONTAMINATED PART OF THE GRAVEL FACING.
2, GHECK THE STRUCTURE FOR DAMAGE FROM EROSION OR PIPING. PERIODICALLY
CHECK THE DEPTH OF THE SPILLWAY TO ENSURE IT IS A MINIMUM OF IS FT. BELOW
TIIE LOW POINT OF THE EMBANKMENT. IMMEDIATELY FILL ANY SETTLEMENT OF THE
EMBANKMENT TO SLIGHTLY ABOVE DESIGN GRADE. ANY RIPRAP DISPLACED FROM
THE SPILLWAY MUST BE REPLACED IMMEDIATELY.
3, AFTER ALL SEDIMENT -PRODUCING AREAS HAVE BEEN PERMANENTLY STAFF IZED.
REMOVE THE STRUCTURE AND ALL UNSTABLE SEDIMENT. SMOOTH THE AREA TO
BLEND WITH THE ADJOINING AREAS AND STABILIZE PROPERLY (REFERENCES:
SURFACE STABILIZATION).
2 ` ,)TEMPORARY SEDIMENT TRAP
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6 457 WASHED STONE & WIRE INLET PROTECTION
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NOTE
BASIN DESIGN
SE PROJECT EROSION CONTRDLPLAN F SPECFGBASIN UMENSIONS AGE ORIENTATION
l h7ER L EPTLREV c
5-0" <k
I'MCM. BASIN PLAN
SURFACE
t i!. QELEVATION
1nP DF DAM
�{{{{{{------FIOAMER
,.Klri. LR SEE DETAIL
'-EMERGENCY SUPPORT POPE OR SUPPORT POST STAKE TO
�OAFFLE 2a
SPILLWAY WRE TO PREVENT
24"INTO BOTTOM SUPPORT WIRE
ELEVATION SAGGING
OR SIDE
J
BASIN BOTTOM ELEVATION
COMPACTED EARTH
EMBANKMENT STABILIZED
OUTLET
-
PARTIALBASINSECTION PROTECTION
CONNIRUC11OriS LC'FICATIUNS
STAPLEDMEN9LAO
P.D.RLF. FLEVnTIO.H STAPLED
t PTIIEAREA IMDATHE ADD
OF MIOUNTS
INTO Rol TUM OR SIDE
TOM Oil SIDE
MOVEAlAND
POOGIFAL
AINING HIGHA,NT
ROOT NIAT, REMOVE FORGVEGETATION
SUREOR
TS OCORGABL
CONSTRUCTION SPECI,'ICAIION
RAT.D STOCKPILE DISPOSE
MATTER MDSiOCNPILE OR OISPOSF, Of IT PROP[RLY. HAUL N.I.OBJECTIONMLE MATERIAL
IT PROrNNGH1 PAUL ALL.
TO THE DESIGNATED DISPOSAL AREA PLACE TEMPOMBYSEDIMENT CONTROL MEASURES
1, GRACE ]HE BASIN SO ME BOTTOM IS LEVEL FROM TO BACK AND SIDE TO SIDE,
BELOW BASIN AS NEEDED
2. JISTALL POST ACROSS THE WIDTH OF THE SEDIMENTTRAR(PRACTICE 662 SEDIMENT FENCE)
3. STEEL POST SHOULD BE DRIVEN TO A DEPTH OF 24 INCHES SPACER A MAXIMUM OF 4 FEET
2.EENSURE THAT Fill t1MFIAL FOR THE U IBAdKLoHYTI: FREE. OPROO1S, WOODYVEGETATION,
APART, AND INSTALLED LIP BY SIDES OF THE VASIN AS WILL TIE TOP OF THE FABPL7 SHOULD
OMAN!,MAUEA.AT[)OTHER OBICRHLI,AMFMATEIIAL. PEACE THE FILL IN UF7S EXIT TD
BE 6 INCHES HIGHER THAN THE INVERT 01:HIT SPISEMAY, FOPS OF LAIDFS SHOULD BE 2 INCHES
EXCEED9INCHES AND MACHINE COMPACT IT. OVER FELL THE EMBANKMENT 6 INCHES TO
LOWWR THANIHE TOP OFTHFBERIA3.
ALLOW FOR SETTLEMENT.
4, INSTALL AT LEAST 71 FREE ROWS OF BAFFLES BETWEEN THE AND THE OUTLET POINT. BASINS
LESS THAN 20 FEET IN FILED MAY USE 2 BAFFLES.
3. BY RED T HE BASIN lO THE SPECIFIED OIMENSIONS, PREVENT THE SKIMMING DEVICE FRONT
5. WHEN USING POST, ADD A SUPPORT WIRE OR ROPE ACROSS THE TOP OF THE MEASURE TO
SE IT LING INTO THE MUD BY EXCAVATING A SHALLOW PIT UNDER THE SIGAIMER OR
PREVENT SAGGING,
OR PROVIDING A LOW SUPPORT UNDER THE SKIMMER OF STONE OR BLOCK
6- WRAP POROUS MATERIAL, LIKE JUTE BACKED BY CDR MATERIAL, OVER ME. TOP WIRE, THE FABRIC
SHOULD HAVE FIVE. TO TEN PERCENT OPENIPNGS IN'REWEAVE ATTACH FABRIC TO A ROPE AND A
4. PLACETIC BARREL UYFICALLY4 INCHSCHEDULF 4OPVC PIPE) ON A FIRM, SMOOTH
SUPPORT STRUCTURE WITH ZIP TIES, WIRE OR STAPLES.
FOUNDATION OF RSPERVIOUS SOIL, DO NOT USE PERVIOUS MATERIAL SUCH AS SAND.
7. THE BOIIDM AND SIDES OF THE FABRIC SHOULD BE ANCHORED IN A TRENCH OR PINNED VATH
GRAVEL, OR CRUSHEDSTONE AS BACKHLLViOUND THE PIPE, PLACETHEHLLMA7ERIAL
8INCH EROSION CONTROL MATTING STAPLES,
AROUND THE PIPE SPILLWAY RI 4-INCH LAYERS AND COMPACT IT UNDER AND AROUND
B. DO NOT SPLICE TTIE FABRIC, BUT USE A CONTINUOUS PIECE ACROSS THE BASIN,
]HE PIPE TO AT LEAST THE SAME DENSITY AS THE ADJACENT EMBANKMENT. CARE MUST BE
TAKEN NOT TO RAISE THE PIPE FROM THE FIRM CONTACT WITH ITS FOUNOATIONWHEN
MAINTENANCE
COMPACTING UNDER THE PIPE HAUNCHES.
PLACE A LIINIMUM DEPTH OF 2 FEET DF COMPACTED BACKFILL OVER THE PIPE SPILLWAY
INSPECT BAFFLES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL. MAKE ANYREOUIRED REPAIRS
BEFORE CROSSING IT WITH CONCRUCIION EOUIPMENT, IN NO CASE SHOULD THE PIPE
IMMEDIATELY,
CONDUIT BE INSTALLED BY CUTTING ATRENCH THROUGH THE DAM AUERTHE EMBANKMENT
IS COMPLETE.
BE SURE TO MAINTAIN ACCESS TO THE BATTLES, SHOULD 111E FABRIC OF A BAFFLE COLLAPSE, TEAR,
DECOMPOSE, OR BECOME INEFFECTIVE, REPLACE 11 PROMPTLY.
5. ASSEMBLE. THE SKIMMED HOLY JAING THE NIANUFAGTURERS INSTRUCTIONS, OR As DESIGNED
REMOVESEDIMENT DEPOSITS WHEN IT REACHES FIALF FULL TO PROVIDE ADEQUATE STORAGE
6. LAY IHE ASSFM6LED SKIMMER ON THE BOTTOM OF THE BASINWITH T HE FLEXIBLE JUINTATTHE
VOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON THE BATTLES.
DOLE I OF IHE BARREL PIPE. ATTACH THE IT EXIBLE JOINT TO THE BARREL_ PIPE AND POSITION IHE
SKIMMER OVE13 THE EXCAVATED PIT OR SUPPORT. BE SURE TO ATTACH A ROPE TO THE SKIMMER
AFTER THE COITRIBUTI.NG DRAINAGE AREA HAS BEEN PROPERLY STABILIZED, REMOVE ALL BAFFLE
AND ANCHOR iH"SD' F 1 f'I.. V !' I-
0 TO .. 0 7 BASIN TIES LLL.LE USED TO ('full. ifrSKlFd"TER 7O THE
R,ATERIAL.. AND LINSIMLE SEDIMENT DEPOSITS BRING TII AREA GRA Ad '. I I'I
E 0 CE, tDGl A9 LLh 1.
SUE, FOR fMA!NTEH .NOEL
Sediment Basin Baffle
7 EARTHEN SPII LWAYS-INSTALLVI SPI TWAY IN UNDIST REPLY SOIL. TO THE GREATEST EXTENT
POSSIBLE, THE ACHIEVEMENT OF BARRED ELEVATIONS, GRADE, DESIGN WIDTH, AND
ENTRANCE AND EXIT CHANNEL SLOPES ARE CRITICAL TO THE SUCCESSFUL OPERATION OF
6" LD. 6CI I. AD SKIMMER
THE SPILLWAY. THE PILLWAYSHOULDBE LINED WITH LAMINATED PLASTIC OR IMPERMEABLE
PVC PIPE BLOAT
INFLUENT
GEOTFMR-1, FABRIC. THE FABRIC I4UST BE WIDE AND LONG ENOUGR TO COVER THE BOTTOTA
6" PVC Do'
AND SIDES AND EXTEND ERIC IBR TOP OF THE DAM FOR ACCORDING IN A TRENCI 1, THE
-
BEND POP,
EDGES MAY BE SECURED VNTII B-INCII TAPES OR PINS, THE A MUST
STAPLES EF FABRIC BEHEFABRIC
TO EXTEND OOYIN THE SLOPE AND EXIT ONIU S TABLE GROUND. THE W INH OF THE TANNIC
MUST BE ONE PIECE, NOT JOINED OR SPLICED; OTHERWISE WATER CAN GET UNDER THE FABRIC.
IF THE L[FIFTH OF THE FABRIC IS INSUFFICIENT FOR THE ENTIRE LENGTH OF THE SPILLWAY,
MOLT PILL SECI JOHN, SPANNING THE COMPLETE WIDTH, MAY BE USED, THE UPPER SECTIONTS)
SHOULD GORDO AP THE LOWER SECTION (STSOTHAT WA'I ER CANNOT HOW UNDER THE FABRIC-
SECURE THEU Pi EDGE ADD SIDES OF 711E FABRIC IN A TRENCH WHY STAPLES OR BIDS.
4PVCVENT 4'x4°TEE
B. INUIS DISCHARGE NESTER INTO THE BASIN IN A AIANNFR TO PREVENT EROSION -USE
TICIPORARYSIOFi D.tAING OR OiVEHSIOUS V.IRi DUTLET PRDTEC,TION TO DIVERT SEDIMENT
ED
FACED PAR LEFT TO IIiF. PULL FND OPINE POOL AREA TO IMPROVE BASIN TRAP EFFICIF. NCY
I
9. EROSIONCONTIIUL CONS TRI)CTTRESTR000RESD711ATTHEDIS1URREDMEAISP.9NIMIZED.
DIVERT SURFACE VIA] Ell AWAY FROM BAIZE AREAS, COMPLETE THE nMBANKMFNT BEFORE
IT MY COIBTROL
GALVANIZED of
1H: AREA IE, AM D SIABII IZE NHL FMEHGENPl FLIT!WAY EISANKMF.NT AND ALI.. OTHER
ORRICE
STRAP 7YPiCAL
DISIURRED Mf SAbOVE THE GREAT UT THE PRINCIPAL SPILLWAY IMMEDIATELY AFTER
„(i1x9TRUCBON.
4'LU. SOH. 4O
D
10- DISTAFF POROUS BAFFLES AS ININCATFD IN SEDIMENT SAYS BAFFLE DETAIL,
11. PERMANENTLY STABIINDWITEMOVG
THEL IPUMOESFDI)ATLTHE UNSTGARFASHAVEBENT
111E RTRUGTURF fd:0 ALL THE Vt151AP,LE SEOItAENi. SMpOTI1TIlE ARF'A'IC BLFflO VlRH 7NE
ADJOINING AREAS hOO G7AOtIZE PROPERLY-
SKIMMER
6"PVC CAP
_
INFLUENT'
LIM1INTIiNAif,F
I.6,.
I lSI E('T SKIMMED EOIMENTOASINS hT LCAST V'lfEKLY AND M1FlER EAOH SIGPlIFlGA(T (ONE-IJALF
INCH 01 CREATED) H INFALL EVENT AND REPAIR IMMEDIATELY. REMOVE SMOOTH AND RESTORE
SKIMMER PLAN
THE BASIN TO ITS OIIIGINAL DIAENEDIIS WORN SEDIMENT ACCUMMULATES TG ONE -I TAU THE
HFIGHT OP (!IE FIRST RAFFLE. PIILLTFIF SNIRi N1ER 1D ONE SIDE SOIHAT TIIE SEDIMENT UNDERNEATH
G i.O. SCH. 40
IICAN BE EXCAVATED EXCAVATE THE SEDIMENT FROM THE ENTIRE BASIN,NLITJUST AROU14DTHL
DPVCVENT PVC PIPE FLOAT
SOMMER OP THE FIRST CELL. MAKE SURE VEGETATION SERVING IN THE DOT OF THE BASIN
3'-6"
DOES NUT HOLD DOWN THE SKIMMER,
�
REPAIR THE BAFTIES IF THEY ARE DAMAGED.RE-ANGHOR THE BAFRES IF WATER IS FLOWING
UNDEM'EANH OR AROUND THEM.
IF THE SKIMMER IS CLOGGED WITH TRASH AND THERE IS WATER IN THE BASIN, USUALLY JERKING
4'22 P SEND
ON THE ROPE WILL MAKE THE SKIMMER BOB UP AND DOWN AND DISLODGE THE DEBRIS AND
SPX HUB
RESTORE FLOW, IF TIIN DOES NOT WORK, PULL THE SKIMMER OVER TO THE SIDE OF THE BASIN
4 PVC TEE
AND REMOVE THE CEIRIS. ALSO CHECK 711E ORIFICE INSIDE THE SKIMMER TO SEE IF IT IS
BTN,STI. HOSE �q°x4•PVG TEE
NI JSPS
CLOGGED: IF SD REMOVE 711E DEBRIS,
lYP.
4" PVC FLANGE
IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THE ORIFICE: CAN BE REMOVED AND THE
4'REXIBLE.
LEDMUCTIOIJ CLEARED WAIH A PLUMBER'S SNAKE OR BY RUSHING WITH WATER.BESUREAND
HOSE
REPLACE THE ORIFICE BEFORE REPOSITIONING THE SKIMMER
3"1-D-SCH. 4O FLOW CONTROL CRFIOE
PVC PIPE CUT DISCOID CIRCULAR
CIIECY. 7111'tVMHL"', UtIED SPW.WAY FOR DAIAAGE AriO rMKEANY PEOVIRED REPNR9 WI'(H ---
,FINING 7O DIh1ENSI0PN
FABRIC TIIND SPANS IIE FUI.LVOTED 1 OF OIL SPILLWAY. OF ECK THE E&S ANKMENT. SPILLWAYS,
INDICATE[) ON BASIN SITE
AND Go FILED FOR EROSION DAMAGE, AND INSPECT IHE EMBANKMENT FOR PIPING AND
BASIN HOT TOM PAN
DEFILEMENT -MAKE ALL NECESSARY REPAIRS IMMEDIATELY. REMOVE ALL MASH ADD OTHER
DEBRIS FROM THE SKIMMER AND POOL AREAS-
SKIMMER ELEVATION
FREEDNGWEAIHER CAN RESULT IN ICE FORMING IN THE BASIN, SOME SPECIAL PRECAUTIONS
SHOULD BE TAKEN IN THE YRNIER TO PREVENT THE SKIMMED FROM PLUGGING WITH ICE.
Floating loafing Surface Skimmer
t ' SEDIMENT BASIN AND SKIMMER
... C507.
© 2019 LaBella Associates
ALAMANCE
AGGREGATES,
1 Threatt,
NO.
DATE:
DESCRIPTION:
REVISIONS
I
PROJECT NUMBER:
2190335
i
DRAWN BY:
KCG/ATC
REVIEWED BY:
PAS
ISSUED FOR:
CONSTRUCTION
DATE;
7/18/19
DRAWING NAME
DRAWING NUMBER:
t